WO2018205701A1

WO2018205701A1 - Touch control display apparatus

Info

Publication number: WO2018205701A1
Application number: PCT/CN2018/075582
Authority: WO
Inventors: 李虎; 何剑
Original assignee: 京东方科技集团股份有限公司; 合肥京东方光电科技有限公司
Priority date: 2017-05-11
Filing date: 2018-02-07
Publication date: 2018-11-15
Also published as: US20210208716A1; CN107168575B; US11442570B2; CN107168575A

Abstract

Disclosed is a touch control display apparatus, comprising: a display panel; a backlight source comprising a backplane; a pressure touch control detection chip; and a pressure sensing layer and a voltage reference layer disposed between the display panel and the backplane, wherein the pressure sensing layer and the voltage reference layer are arranged opposite each other and are disposed on different layers; the pressure sensing layer comprises a plurality of sensing electrodes arranged in an array, and each of the sensing electrodes is electrically connected to the pressure touch control detection chip via a lead; the voltage reference layer is used for receiving a stable reference voltage signal; and the pressure touch control detection chip is configured to determine, according to the detected variation amount of capacitance between the pressure sensing layer and the voltage reference layer, the value of pressure applied to the display panel.

Description

Touch display device

Related application

The present PCT application claims the priority of the Chinese Patent Application No. PCT Application No.

Technical field

The present disclosure relates to the field of display technologies, and in particular, to a touch display device.

Background technique

With the development of technology, ordinary displays on electronic products are gradually being replaced by three-dimensional (3D) displays and 3D touch screens. The current 3D touch display device is based on 2D touch (ie, touch in the X and Y directions), and additionally adds a pressure touch for sensing the deformation of the display module module in addition to the display module. The unit comes to be implemented.

As the size of the display module increases, the mechanical strength of the display module also increases correspondingly, resulting in a weak deformation of the display module caused by conventional finger pressure (0 to 9.8 N). Therefore, for a larger size display module, the sensitivity of sensing the pressure touch by the deformation of the display module is less sensitive.

Summary of the invention

In view of this, embodiments of the present disclosure provide a touch display device including a display panel, a backlight, the backlight including a back panel, a pressure touch detection chip, and the display panel and the back panel. a pressure sensing layer and a voltage reference layer, the pressure sensing layer is opposite to the voltage reference layer and arranged in a different layer; wherein the pressure sensing layer comprises a plurality of sensing electrodes arranged in an array, each of the sensing electrodes Each of the voltage touch detection layers is electrically connected to the pressure touch detection chip; the voltage reference layer is configured to receive a stable reference voltage signal; and the pressure touch detection chip is configured to detect the pressure sensing layer and the The amount of change in capacitance between the voltage reference layers determines the value of the pressure experienced by the display panel.

Optionally, the display panel includes an array substrate, and the touch display device further includes a first polarizer on a side of the array substrate facing the backplane, wherein the voltage reference layer is disposed at the Between the first polarizer and the array substrate.

Optionally, the voltage reference layer is a transparent conductive layer and covers the entire array substrate.

Optionally, the voltage reference layer is grounded.

Optionally, the backlight further includes a light guide plate, and a reflective sheet positioned between the light guide plate and the back plate; wherein the pressure sensing layer is disposed on the reflective sheet facing the back plate One side.

Optionally, the backlight further includes a resin layer positioned between a side of the reflective sheet facing the back sheet and between the reflective sheet and the pressure sensing layer.

Optionally, the touch display device further includes a flexible circuit board and a printed circuit board, wherein the pressure touch detection chip is integrated on one of the flexible circuit board and the printed circuit board.

Optionally, the touch display device further includes a dielectric layer disposed between the pressure sensing layer and the backplane and covering the array substrate.

Optionally, the dielectric layer is a non-conductive double-sided adhesive layer.

Optionally, the double-sided adhesive layer has a thickness of 0.2 mm to 0.3 mm.

Optionally, the display panel is a touch display panel.

DRAWINGS

The drawings are used to provide a further understanding of the present disclosure, and are not a limitation of the disclosure. In the drawing:

FIG. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present disclosure;

2 is a schematic structural diagram of a pressure sensing layer according to an embodiment of the present disclosure;

FIG. 3 is a schematic structural diagram of another touch display device according to an embodiment of the present disclosure;

FIG. 4 is a schematic structural diagram of another touch display device according to an embodiment of the present disclosure;

FIG. 5 is a schematic structural diagram of still another touch display device according to an embodiment of the present disclosure;

FIG. 6 is a schematic structural diagram of still another touch display device according to an embodiment of the present disclosure;

FIG. 7 is a schematic structural diagram of a touch display device according to an embodiment of the present disclosure.

detailed description

The present disclosure will be further described in detail below with reference to the accompanying drawings. It is apparent that the described embodiments are only a part of the embodiments of the present disclosure, and not all of them.

The thicknesses of the layers and the size and shape of the regions shown in the drawings do not represent their true dimensions or proportions, but merely illustrate the disclosure.

FIG. 1 is a schematic structural diagram of a touch display device according to an embodiment of the present disclosure. As shown in FIG. 1 , the touch display device includes a display panel 31 and a backlight, and the backlight includes a back plate 32 . The specific arrangement of the display panel 31 and the backlight is the same as that in the prior art, and details are not described herein again. The touch display device may further include a pressure touch detection chip (not shown in the drawing, which may be located at any suitable position), a pressure sensing layer 33 and a voltage reference layer 34 disposed between the display panel 31 and the back plate 32. .

FIG. 2 is a schematic structural diagram of a pressure sensing layer 33 according to an embodiment of the present disclosure. As shown in FIG. 2, the pressure sensing layer 33 includes a plurality of sensing electrodes 331 arranged in an array, and each of the sensing electrodes 331 is electrically connected to the pressure touch detecting chip through a lead 332.

The voltage reference layer 34 is for receiving a stable reference voltage signal, and the pressure sensing layer 33 is opposite to the voltage reference layer 34 and arranged in a different layer. The pressure touch detection chip is configured to determine a value of the pressure received by the display panel 31 based on the detected amount of change in capacitance between the pressure sensing layer 33 and the voltage reference layer 34.

Since the pressure sensing layer and the voltage reference layer in the embodiment of the present disclosure are disposed between the display panel and the back plate, and the pressure sensing layer and the voltage reference layer are opposite and arranged in different layers, a pressure sensing layer and a voltage reference layer are formed. capacitance. The pressure touch detection chip is configured to determine a pressure value received by the display panel according to the amount of change in capacitance between the detected pressure sensing layer and the voltage reference layer. In the prior art, the pressure touch unit is usually disposed outside the display module, and the pressure sensing layer and the voltage reference layer for forming a capacitor in the embodiment of the present disclosure are disposed between the display panel and the back panel (ie, disposed in the display mode). The inside of the group), which can reflect the magnitude of the pressure by detecting the deformation of the display panel. Compared with the prior art, the embodiments of the present disclosure can improve the sensitivity of the pressure touch, and are advantageous for realizing a lighter, thinner, and more integrated product.

The touch display device in the embodiment of the present disclosure further includes a flexible circuit board and a printed circuit board. The pressure touch detection chip can be integrated on a flexible circuit board or a printed circuit board. Of course, in practice, the pressure touch detection chip can also be separately arranged in the touch display device. The specific arrangement position and arrangement manner of the flexible circuit board and the printed circuit board in the touch display device are similar to those in the prior art, and are not described herein again.

The display panel provided by the embodiment of the present disclosure is a display panel with a touch function, that is, a touch display panel. The display panel with touch function can detect the specific position of the pressure on the display panel (i.e., the X and Y coordinates of the detected pressure point). The display panel with the touch function in the embodiment of the present invention may be a self-capacitance touch display panel or a mutual capacitance touch display panel; wherein the specific arrangement of the self-capacitance electrodes and the self-capacitance touch display The specific manner of detecting the touch position of the panel is the same as that in the prior art; the specific arrangement of the mutual capacitance electrodes (the drive electrodes and the sensing electrodes which are mutually intersected and insulated), and the detection touch position of the mutual capacitance touch display panel The specific manner is the same as that in the prior art, and details are not described herein again.

In a further embodiment, as shown in FIG. 3, the display panel 31 in the touch display device includes an array substrate 311 and a color filter substrate 312 disposed opposite to each other. The touch display device further includes a first polarizer 52 on the side of the array substrate 311 facing the back plate 32 and a second polarizer 51 on the side of the color filter substrate 312 facing away from the array substrate 311, the second polarizer 51 and the first The specific arrangement of the polarizer 52 is the same as that of the prior art, and details are not described herein again.

Optionally, the voltage reference layer 34 in this embodiment is disposed between the first polarizer 52 and the array substrate 311. Thus, in the present embodiment, the voltage reference layer 34 receives a constant voltage signal and is not affected by the metal film layer (eg, the gate metal layer, the source and drain metal layers) included in the array substrate, so that the pressure sensing layer 33 and the voltage The stability of the capacitance formed by the reference layer 34 can be ensured.

The voltage reference layer 34 in the embodiment of the present invention may be a transparent conductive layer and cover the entire array substrate 311. The voltage reference layer 34 is a transparent conductive layer to minimize the influence on the backlight that is incident on the display panel 31, thereby maximizing the utilization of light. The voltage reference layer 34 covering the entire array substrate 311 enables the pressure touch detection chip to more accurately detect the pressure received by the entire display panel 31. In some embodiments, the voltage reference layer 34 may be a single layer film formed of indium tin oxide (ITO) or indium zinc oxide (IZO), or may be a mixed film layer formed of ITO and IZO.

Alternatively, the voltage reference layer 34 can be grounded, which is more convenient and simple in practice.

The material of the pressure-sensitive layer 33 in the embodiment of the present disclosure may be a transparent conductive material, for example, a single-layer film formed of ITO or IZO, or a mixed film layer formed of ITO and IZO. Of course, the material of the pressure sensing layer 33 may also be any combination of one or more of metals such as molybdenum (Mo), aluminum (Al), silver (Ag), copper (Cu), etc. It is not specifically limited in the disclosure.

In a further embodiment, as shown in FIG. 4, the backlight in the touch display device further includes a light guide plate 61 and a reflective sheet 62 between the light guide plate 61 and the back plate 32. The specific arrangement of the light guide plate 61 and the reflection sheet 62 in the embodiment of the present disclosure is the same as that in the prior art, and details are not described herein again.

Alternatively, the pressure sensing layer 33 in this embodiment is disposed on a side of the reflective sheet 62 facing the backing plate 32. As shown in FIG. 4, the pressure sensing layer 33 is disposed under the reflective sheet 62, which can overcome the poor optical influence of the pressure sensing layer 33 on the display module, thereby improving the brightness and picture quality of the touch display device.

In a further embodiment, as shown in FIG. 5, the backlight of the touch display device further includes a resin layer 71 located on a side of the reflective sheet 62 facing the backing plate 32, and located at the reflective sheet 62 and the pressure sensing layer. Between 33. In this way, the resin layer 71 can serve as a carrier for the pressure sensing layer 33. In practice, the pressure sensing layer 33 can be formed on the resin layer 71, and then the resin layer 71 can be attached to the reflective sheet 62. This ensures that the pressure sensing layer 33 is disposed without affecting the reflective sheet 62, for example: The reflection sheet 62 is not scratched.

In a further embodiment, as shown in FIG. 6, the touch display device further includes a dielectric layer 81 disposed between the pressure sensing layer 33 and the backing plate 32, and the dielectric layer 81 covers the array substrate 311. The material of the back plate 32 may be stainless steel or aluminum, so that the dielectric layer 81 can avoid excessive base capacitance between the pressure sensing layer 33 and the back plate 32. The arrangement of the dielectric layer 81 increases the distance between the pressure sensing layer 33 and the backing plate 32, reducing the base capacitance generated between the pressure sensing layer 33 and the backing plate 32. When the display panel is under pressure, the base capacitance has little effect on the capacitance formed by the pressure sensing layer 33 and the voltage reference layer 34, which can improve the sensitivity of the pressure touch.

The dielectric layer 81 in this embodiment may be a non-conductive double-sided adhesive layer, and the double-sided adhesive layer can adhere to the pressure sensing layer 33 and the back plate 32 to stabilize the pressure sensing layer 33. The double-sided adhesive layer can be made of a material which has certain viscosity, is not acidic, and is not easily deformed under pressure. For example, the double-sided adhesive layer may be a rubber layer composed of an acrylic adhesive of 0.05 mm thickness, a resin layer of 0.2 mm thickness, and an acrylic adhesive of 0.05 mm thickness.

Optionally, the double-sided adhesive layer has a thickness of 0.2 mm to 0.3 mm. It should be pointed out that if the double-sided adhesive layer is too thick, the thickness of the touch display device is increased, which is disadvantageous for the thinning of the touch display device; if the double-sided adhesive layer is too thin, the pressure sensing layer 33 and the back are not The base capacitance generated between the plates 32 has a large effect. Of course, the double-sided adhesive layer may have other thicknesses, and the embodiments of the present disclosure are not limited thereto.

A touch display device provided by an embodiment of the present disclosure will now be described in conjunction with a specific embodiment. As shown in FIG. 7 , the touch display device includes: a back plate 32 , a dielectric layer 81 , a pressure sensing layer 33 , a resin layer 71 , a reflective sheet 62 , a light guide plate 61 , a prism sheet 92 , a sealant 93 , a mouth glue 91 , and a first A polarizer 52, a voltage reference layer 34, an array substrate 311, a color filter substrate 312, and a second polarizer 51. The specific arrangement of the back plate 32, the reflective sheet 62, the light guide plate 61, the prism sheet 92, and the sealant 93 is the same as that of the prior art, and details are not described herein again.

The specific arrangement of the mouth glue 91 in this embodiment is similar to the prior art, except that the thickness of the mouth glue 91 in this embodiment is greater than the thickness of the prior art mouth glue. For example, the thickness of the mouth glue 91 can be set to 0.3 mm. In addition, when selecting the material of the mouth glue 91, it is necessary to select a material that is not easily deformed by pressure so as not to affect the touch sensitivity of the touch display device.

In this embodiment, each lead 332 can be drawn through a flexible circuit. The sealant 93 and the backing plate 32 are provided with corresponding outlets (not shown) at the flexible circuit take-out position. Each lead 332 is electrically connected to the pressure touch detection chip via the flexible circuit, thereby transmitting the pressure touch signal to the pressure touch detection chip.

When the user presses the display panel, the display panel with the touch function in the embodiment of the present disclosure can determine the specific position of the user's finger press. The pressure touch detection chip can determine the value of the pressure of the user pressing the display panel by detecting the amount of change in capacitance between the pressure sensing layer and the voltage reference layer in real time, which reflects the magnitude of the deformation generated by the display panel.

In summary, the present disclosure provides a touch display device including a display panel and a backlight, and the backlight includes a back plate. The touch display device may further include a pressure touch detection chip, a pressure sensing layer and a voltage reference layer disposed between the display panel and the back plate. The pressure sensing layer includes a plurality of sensing electrodes arranged in an array, and each of the sensing electrodes is electrically connected to the pressure touch detecting chip through a lead. The voltage reference layer is for receiving a constant voltage signal and is opposite to the voltage reference layer and arranged in a different layer. The pressure touch detection chip is configured to determine a value of a pressure received by the display panel based on the amount of change in capacitance between the detected pressure sensing layer and the voltage reference layer. Compared with the prior art, the pressure touch unit is disposed outside the display module, and the pressure sensing layer and the voltage reference layer for forming a capacitor in the embodiment of the present disclosure are disposed between the display panel and the back panel, that is, disposed on the display module. Inside the group, this determines the value of the pressure by detecting the deformation of the display panel. Compared with the prior art in determining the value of the pressure by detecting the deformation of the display module, the technical solution of the present disclosure can improve the sensitivity of the pressure touch.

It is apparent that those skilled in the art can make various modifications and variations to the embodiments of the present disclosure without departing from the spirit and scope of the disclosure. Thus, it is intended that the present invention cover the modifications and modifications of the invention

Claims

A touch display device includes:

Display panel

a backlight, the backlight comprising a backplane;

Pressure touch detection chip;

a pressure sensing layer and a voltage reference layer disposed between the display panel and the back plate, the pressure sensing layer being opposite to the voltage reference layer and arranged in a different layer;

The pressure sensing layer includes a plurality of sensing electrodes arranged in an array, and each of the sensing electrodes is electrically connected to the pressure touch detecting chip through a lead;

The voltage reference layer is configured to receive a stable reference voltage signal;

The pressure touch detection chip is configured to determine a value of a pressure received by the display panel according to the detected amount of change in capacitance between the pressure sensing layer and the voltage reference layer.
The touch display device of claim 1 , wherein the display panel comprises an array substrate, and the touch display device further comprises a first polarizer on a side of the array substrate facing the backplane, Wherein the voltage reference layer is disposed between the first polarizer and the array substrate.
The touch display device according to claim 2, wherein the voltage reference layer is a transparent conductive layer and covers the entire array substrate.
The touch display device of claim 3, wherein the voltage reference layer is grounded.
The touch display device of claim 1 , wherein the backlight further comprises a light guide plate, and a reflective sheet positioned between the light guide plate and the back plate;

Wherein the pressure sensing layer is disposed on a side of the reflective sheet facing the backing plate.
The touch display device according to claim 5, wherein the backlight further comprises a resin layer, the resin layer is positioned on a side of the reflective sheet facing the back sheet, and the reflective sheet and the Between the pressure sensing layers.
The touch display device of claim 1, further comprising a flexible circuit board and a printed circuit board, wherein the pressure touch detection chip is integrated on one of the flexible circuit board and the printed circuit board.
The touch display device according to any one of claims 1 to 7, further comprising a dielectric layer disposed between the pressure sensing layer and the backing plate and covering the array substrate.
The touch display device according to claim 8, wherein the dielectric layer is a non-conductive double-sided adhesive layer.
The touch display device according to claim 9, wherein the double-sided adhesive layer has a thickness of 0.2 mm to 0.3 mm.
The touch display device of claim 1 , wherein the display panel is a touch display panel.